Cell Death Mechanisms in Cancer Biology

Cancer development and therapy hinge on the balance between cell survival and regulated cell death. Tumour cells often acquire resistance to apoptosis, the classical caspase-driven programme of organised cell dismantling, allowing unchecked proliferation. To overcome this, attention has turned to alternative death pathways such as necroptosis, ferroptosis and pyroptosis, each defined by distinct molecular triggers and morphological features. Necroptosis is a caspase-independent form of regulated necrosis mediated by the kinases RIPK1 and RIPK3 and the effector MLKL, and can elicit robust inflammatory and immune-stimulatory responses. Ferroptosis proceeds via iron-dependent lipid peroxidation, while pyroptosis relies on inflammasome-activated gasdermins to perforate membranes. These pathways interact closely with autophagy, endoplasmic reticulum stress responses and metabolic signalling, forming a complex network that shapes tumour progression, therapy resistance and the local immune landscape. Harnessing non-apoptotic death modes offers routes to overcome chemoresistance, promote tumour antigen release and reprogramme the tumour microenvironment for improved immunotherapy outcomes.

Research from Nature Portfolio

Recent studies have dissected the molecular checkpoints that steer cells between apoptosis and necroptosis. One report revealed that phosphorylation of RIPK1 by TAK1 at specific serine residues functions as a rheostat: transient modification favours a caspase-driven apoptosis, whereas sustained phosphorylation promotes RIPK1–RIPK3 interaction and necroptotic commitment. Another investigation demonstrated that mitochondrial reactive oxygen species serve as a trigger for RIPK1 autophosphorylation, establishing a positive-feedback loop that recruits RIPK3 into the necrosome and amplifies lytic cell death. In addition, work on RIPK3 has shown that, beyond its role in membrane rupture, it can activate inflammasome assembly and caspase-1 independently of MLKL, linking kinase signalling to pro-inflammatory cytokine maturation in the tumour milieu.

Cell Death Mechanisms in Cancer Biology publication trend

The graph below shows the total number of articles in cell death mechanisms in cancer biology across all publications each year (not limited to Nature Index journals).

Technical terms

Apoptosis: A programmed cell death process mediated by caspases, characterised by cell shrinkage, chromatin condensation and non-inflammatory clearance of cellular debris.

Necroptosis: A regulated form of necrosis triggered when caspase-8 is inhibited, involving RIPK1 and RIPK3 kinase activity and MLKL-mediated membrane permeabilisation, often provoking inflammation.

Kinase: An enzyme that transfers a phosphate group to target proteins, modulating their activity, localisation or interactions.

Necrosome: The multiprotein complex formed by RIPK1 and RIPK3 in necroptotic signalling that orchestrates downstream execution events.

Inflammasome: A cytosolic multiprotein assembly that activates inflammatory caspases, leading to cytokine maturation and pyroptotic cell death.

References

1. The role of necroptosis in cancer biology and therapy. Molecular Cancer (2019).
2. RIP1 autophosphorylation is promoted by mitochondrial ROS and is essential for RIP3 recruitment into necrosome. Nature Communications (2017).
3. RIPK3 promotes cell death and NLRP3 inflammasome activation in the absence of MLKL. Nature Communications (2015).
4. Vaccination with Necroptotic Cancer Cells Induces Efficient Anti-tumor Immunity. Cell Reports (2016).
5. Regulation of RIPK1 activation by TAK1-mediated phosphorylation dictates apoptosis and necroptosis. Nature Communications (2017).